diff --git a/examples/single_chip/camera_web_server/main/app_httpd.c b/examples/single_chip/camera_web_server/main/app_httpd.c
index 48f3df8..25e8dbe 100644
--- a/examples/single_chip/camera_web_server/main/app_httpd.c
+++ b/examples/single_chip/camera_web_server/main/app_httpd.c
@@ -294,6 +294,108 @@ void enable_led(bool en)
 }
 #endif
 
+static esp_err_t set_variable(const char *variable, int val, sensor_t *s, bool ignore_unknown)
+{
+    int res = 0;
+
+    ESP_LOGI(TAG, "%s = %d", variable, val);
+
+    if (!strcmp(variable, "framesize")) {
+        if (s->pixformat == PIXFORMAT_JPEG) {
+            res = s->set_framesize(s, (framesize_t)val);
+            if (res == 0) {
+                app_mdns_update_framesize(val);
+            }
+        }
+    }
+    else if (!strcmp(variable, "fps_max")) {
+        fps_max = val;
+        fps_period_us = FPS_TO_PERIOD(fps_max);
+    }
+    else if (!strcmp(variable, "quality"))
+        res = s->set_quality(s, val);
+    else if (!strcmp(variable, "contrast"))
+        res = s->set_contrast(s, val);
+    else if (!strcmp(variable, "brightness"))
+        res = s->set_brightness(s, val);
+    else if (!strcmp(variable, "saturation"))
+        res = s->set_saturation(s, val);
+    else if (!strcmp(variable, "gainceiling"))
+        res = s->set_gainceiling(s, (gainceiling_t)val);
+    else if (!strcmp(variable, "colorbar"))
+        res = s->set_colorbar(s, val);
+    else if (!strcmp(variable, "awb"))
+        res = s->set_whitebal(s, val);
+    else if (!strcmp(variable, "agc"))
+        res = s->set_gain_ctrl(s, val);
+    else if (!strcmp(variable, "aec"))
+        res = s->set_exposure_ctrl(s, val);
+    else if (!strcmp(variable, "hmirror"))
+        res = s->set_hmirror(s, val);
+    else if (!strcmp(variable, "vflip"))
+        res = s->set_vflip(s, val);
+    else if (!strcmp(variable, "awb_gain"))
+        res = s->set_awb_gain(s, val);
+    else if (!strcmp(variable, "agc_gain"))
+        res = s->set_agc_gain(s, val);
+    else if (!strcmp(variable, "aec_value"))
+        res = s->set_aec_value(s, val);
+    else if (!strcmp(variable, "aec2"))
+        res = s->set_aec2(s, val);
+    else if (!strcmp(variable, "dcw"))
+        res = s->set_dcw(s, val);
+    else if (!strcmp(variable, "bpc"))
+        res = s->set_bpc(s, val);
+    else if (!strcmp(variable, "wpc"))
+        res = s->set_wpc(s, val);
+    else if (!strcmp(variable, "raw_gma"))
+        res = s->set_raw_gma(s, val);
+    else if (!strcmp(variable, "lenc"))
+        res = s->set_lenc(s, val);
+    else if (!strcmp(variable, "special_effect"))
+        res = s->set_special_effect(s, val);
+    else if (!strcmp(variable, "wb_mode"))
+        res = s->set_wb_mode(s, val);
+    else if (!strcmp(variable, "ae_level"))
+        res = s->set_ae_level(s, val);
+#ifdef CONFIG_LED_ILLUMINATOR_ENABLED
+    else if (!strcmp(variable, "led_intensity")) {
+        led_duty = val;
+        if (isStreaming)
+            enable_led(true);
+    }
+#endif
+
+#if CONFIG_ESP_FACE_DETECT_ENABLED
+    else if (!strcmp(variable, "face_detect")) {
+        detection_enabled = val;
+#if CONFIG_ESP_FACE_RECOGNITION_ENABLED
+        if (!detection_enabled) {
+            recognition_enabled = 0;
+        }
+#endif
+    }
+#if CONFIG_ESP_FACE_RECOGNITION_ENABLED
+    else if (!strcmp(variable, "face_enroll"))
+        is_enrolling = val;
+    else if (!strcmp(variable, "face_recognize")) {
+        recognition_enabled = val;
+        if (recognition_enabled) {
+            detection_enabled = val;
+        }
+    }
+#endif
+#endif
+    else {
+        ESP_LOGI(TAG, "Unknown variable: %s = %d", variable, val);
+        if (!ignore_unknown) {
+            res = -1;
+        }
+    }
+
+    return res;
+}
+
 static esp_err_t bmp_handler(httpd_req_t *req)
 {
     camera_fb_t *fb = NULL;
@@ -714,6 +816,7 @@ static esp_err_t cmd_handler(httpd_req_t *req)
     char *buf = NULL;
     char variable[32];
     char value[32];
+    esp_err_t res;
 
     if (parse_get(req, &buf) != ESP_OK) {
         return ESP_FAIL;
@@ -727,100 +830,9 @@ static esp_err_t cmd_handler(httpd_req_t *req)
     free(buf);
 
     int val = atoi(value);
-    ESP_LOGI(TAG, "%s = %d", variable, val);
     sensor_t *s = esp_camera_sensor_get();
-    int res = 0;
 
-    if (!strcmp(variable, "framesize")) {
-        if (s->pixformat == PIXFORMAT_JPEG) {
-            res = s->set_framesize(s, (framesize_t)val);
-            if (res == 0) {
-                app_mdns_update_framesize(val);
-            }
-        }
-    }
-    else if (!strcmp(variable, "fps_max")) {
-        fps_max = val;
-        fps_period_us = FPS_TO_PERIOD(fps_max);
-    }
-    else if (!strcmp(variable, "quality"))
-        res = s->set_quality(s, val);
-    else if (!strcmp(variable, "contrast"))
-        res = s->set_contrast(s, val);
-    else if (!strcmp(variable, "brightness"))
-        res = s->set_brightness(s, val);
-    else if (!strcmp(variable, "saturation"))
-        res = s->set_saturation(s, val);
-    else if (!strcmp(variable, "gainceiling"))
-        res = s->set_gainceiling(s, (gainceiling_t)val);
-    else if (!strcmp(variable, "colorbar"))
-        res = s->set_colorbar(s, val);
-    else if (!strcmp(variable, "awb"))
-        res = s->set_whitebal(s, val);
-    else if (!strcmp(variable, "agc"))
-        res = s->set_gain_ctrl(s, val);
-    else if (!strcmp(variable, "aec"))
-        res = s->set_exposure_ctrl(s, val);
-    else if (!strcmp(variable, "hmirror"))
-        res = s->set_hmirror(s, val);
-    else if (!strcmp(variable, "vflip"))
-        res = s->set_vflip(s, val);
-    else if (!strcmp(variable, "awb_gain"))
-        res = s->set_awb_gain(s, val);
-    else if (!strcmp(variable, "agc_gain"))
-        res = s->set_agc_gain(s, val);
-    else if (!strcmp(variable, "aec_value"))
-        res = s->set_aec_value(s, val);
-    else if (!strcmp(variable, "aec2"))
-        res = s->set_aec2(s, val);
-    else if (!strcmp(variable, "dcw"))
-        res = s->set_dcw(s, val);
-    else if (!strcmp(variable, "bpc"))
-        res = s->set_bpc(s, val);
-    else if (!strcmp(variable, "wpc"))
-        res = s->set_wpc(s, val);
-    else if (!strcmp(variable, "raw_gma"))
-        res = s->set_raw_gma(s, val);
-    else if (!strcmp(variable, "lenc"))
-        res = s->set_lenc(s, val);
-    else if (!strcmp(variable, "special_effect"))
-        res = s->set_special_effect(s, val);
-    else if (!strcmp(variable, "wb_mode"))
-        res = s->set_wb_mode(s, val);
-    else if (!strcmp(variable, "ae_level"))
-        res = s->set_ae_level(s, val);
-#ifdef CONFIG_LED_ILLUMINATOR_ENABLED
-    else if (!strcmp(variable, "led_intensity")) {
-        led_duty = val;
-        if (isStreaming)
-            enable_led(true);
-    }
-#endif
-
-#if CONFIG_ESP_FACE_DETECT_ENABLED
-    else if (!strcmp(variable, "face_detect")) {
-        detection_enabled = val;
-#if CONFIG_ESP_FACE_RECOGNITION_ENABLED
-        if (!detection_enabled) {
-            recognition_enabled = 0;
-        }
-#endif
-    }
-#if CONFIG_ESP_FACE_RECOGNITION_ENABLED
-    else if (!strcmp(variable, "face_enroll"))
-        is_enrolling = val;
-    else if (!strcmp(variable, "face_recognize")) {
-        recognition_enabled = val;
-        if (recognition_enabled) {
-            detection_enabled = val;
-        }
-    }
-#endif
-#endif
-    else {
-        ESP_LOGI(TAG, "Unknown command: %s", variable);
-        res = -1;
-    }
+    res = set_variable(variable, val, s, false);
 
     if (res < 0) {
         return httpd_resp_send_500(req);